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07 June 2011. Invertebrate-1.ppt. 2. Animal Life . Four critical processesObtain energy and materialIngest, digest, absorbObtain oxygen Dispose of nitrogenous wasteNH3, urea, uric acid Dispose of CO2Easy for 1-few cells. 07 June 2011. Invertebrate-1.ppt. 3. Animal Life . Harder for multicellular organismsInternal circulationCoordination, information transferStructural maintenanceMovementMaintenance of homeostatic internal environment.

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